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Looking at buying a patented device. Owner has patent from his grandfather from 1961. https://www.google.com/patents/US3084306 Is this patent still legal and is it protected?
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In general, the patents issued in the '60s were valid for 17 years after the date of issue. Today, in the US, patents are valid for 20 years from the date of filing, with some exceptions.
Answered on Feb 25th, 2014 at 9:13 AM
US Patent 3,084,306 expired a very long time ago and as a result cannot be enforced any longer. Thus, the subject matter of the patent is available for use by anyone.
Answered on Feb 24th, 2014 at 4:26 PM